Quote (fingerling @ Feb 13 2013 12:21am)
fill in the blank
_______ + 59/27 Co (59 atomic mass 27 atomic #) -----> 56/25 Mn + 4/2 He
Add up the atomic mass on the right side --> 56 + 4 = 60
Add up the # protons on the right side --> 25 + 2 = 27
The atomic mass on the left side must be the same, so x + 59 = 60 --> x = 1
The # protons on the left side must be the same, so y + 27 = 27 --> y = 0
Something with an atomic mass of 1 and is not a proton? That's exactly 1 neutron.